Strain-Sensor Input Structure for Accurate Horizontal Load Detection
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Solution Overview
Problem
Existing coordinate input devices face challenges in accurately applying a load to a predetermined position from a predetermined direction due to variations in load application direction and position, affecting the output of strain detection sensors.
Innovation Solution
The input device incorporates a strain generation body with a pillar section and four strain sensors disposed in different directions, featuring protrusions on its outer surface to ensure accurate load application from specific directions, allowing for precise detection of horizontal operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If strain sensors are disposed to detect horizontal operations, then detection capability is provided, but load application accuracy deteriorates due to variations in load application direction and position
Solution Approach 1:
The patent introduces a load application guide structure as an intermediary component between the external load source and the strain generation body. This guide structure ensures that the load is applied precisely to the predetermined position in the predetermined direction, eliminating variations in load application. The guide structure acts as a mediator that transfers the load accurately without requiring high precision in the loading operation itself, thus resolving the contradiction between detection accuracy and load application accuracy.
2Adaptability or versatility
If four strain sensors are disposed in four directions to detect horizontal operations, then detection coverage is improved, but inspection complexity increases due to difficulty in applying load from predetermined directions
Solution Approach 1:
The patent segments the load application function into multiple guide structures, each corresponding to a specific strain sensor and designed to apply load from a specific direction. By dividing the inspection process into separate directional load applications, the system can efficiently test each sensor independently without requiring complex multi-directional loading operations. This segmentation approach maintains comprehensive detection coverage while simplifying the inspection procedure.
3Manufacturing precision
If protrusions are added to the pillar section to improve load application accuracy, then manufacturing complexity increases
Solution Approach 1:
The patent applies the local quality principle by adding protrusions only at specific locations on the pillar section where load application occurs, rather than modifying the entire structure. These localized protrusions provide precise load application points without significantly increasing overall manufacturing complexity. The protrusions are strategically positioned to guide the load into the strain generation body accurately, achieving high load application precision with minimal additional manufacturing steps.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables accurate detection of horizontal operations by ensuring consistent load application, enhancing the precision of strain sensor output and simplifying the inspection process, thereby improving the device's operational accuracy and reducing defects.
Implementation Method 1
detecting a strain in the strain generation body by using a strain detection sensor provided to the base of the strain generation body
Data Source
AI summary
An input device includes a strain generation body having a base and a pillar section extending from the base in a vertical direction, and four strain sensors disposed to the base of the strain generation body. The four strain sensors are disposed in four directions different by 90° with respect to a center of the pillar section, the pillar section has protrusions on an outer circumferential surface in a tip portion, the protrusions protruding in a horizontal direction, the protrusions includes two protrusions protruding in directions opposite to each other with respect to the center of the pillar section, and the two protrusions are provided, with respect to the center of the pillar section, in directions different from the four directions in which the four strain sensors are disposed.